oracle根据日期显示星期几,Oracle获取周几以及每周对应得开始日期和结束日期

Oracle获取周几以及每周对应得开始日期和结束日期

--获取近一年周的开始日期和结束日期，从星期日开始

select

'2014'||sunday.the_week,decode(sign(sunday.the_day-saturday.the_day),-1,sunday.the_day,sunday.the_day-7)

sunday,saturday.the_day saturday from

(select to_char(wwm,'WW') the_week,to_char(wwm,'D') the_daynum,wwm the_day from (select

trunc(to_date('2014-01-01','yyyy-mm-dd'), 'MM')+rownum-1 as wwm from user_objects where rownum < 366) where

to_char(wwm,'D')=1 ) sunday,

(select to_char(wwm,'WW') the_week,to_char(wwm,'D') the_daynum,wwm the_day  from (select

trunc(to_date('2014-01-01','yyyy-mm-dd'), 'MM')+rownum-1 as wwm from user_objects where rownum < 366) where

to_char(wwm,'D')=7 ) saturday

where sunday.the_week=saturday.the_week;

--获取近一年周的开始日期和结束日期，从星期一开始

select

'2014'||monday.the_week,decode(sign(monday.the_day-sunday.the_day),-1,monday.the_day,monday.the_day-6)

sunday,sunday.the_day sunday from

(select to_char(wwm,'WW') the_week,to_char(wwm,'D') the_daynum,wwm the_day from (select

trunc(to_date('2014-01-01','yyyy-mm-dd'), 'MM')+rownum-1 as wwm from user_objects where rownum < 366) where

to_char(wwm,'D')=1 ) monday,

(select to_char(wwm,'WW') the_week,to_char(wwm,'D') the_daynum,wwm+1 the_day  from (select

trunc(to_date('2014-01-01','yyyy-mm-dd'), 'MM')+rownum-1 as wwm from user_objects where rownum < 366) where

to_char(wwm,'D')=7 ) sunday

where monday.the_week=sunday.the_week;